Hummingbirds are among the smallest birds in the world, ranging from 7.5-13 cm in length. They can flap their wings extremely fast, from 10-90 times per second depending on the species. Hummingbirds are unique in their ability to fly in any direction, including backwards and upside down. They feed by inserting long tongues into flowers to drink nectar and consume insects. Males have brightly colored patches of feathers called gorgets that they use in courtship displays. Females build small cup-shaped nests out of spiderwebs and lay two eggs.